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#include <assert.h>
#include <errno.h>
#include <libinput.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wayland-server.h>
#include <wlr/backend/drm.h>
#include <wlr/backend/headless.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/libinput.h>
#include <wlr/backend/multi.h>
#include <wlr/backend/session.h>
#include <wlr/backend/wayland.h>
#include <wlr/config.h>
#include <wlr/util/log.h>
/* WLR_HAS_X11_BACKEND needs to be after wlr/config.h */
#ifdef WLR_HAS_X11_BACKEND
#include <wlr/backend/x11.h>
#endif
void wlr_backend_init(struct wlr_backend *backend,
const struct wlr_backend_impl *impl) {
assert(backend);
backend->impl = impl;
wl_signal_init(&backend->events.destroy);
wl_signal_init(&backend->events.new_input);
wl_signal_init(&backend->events.new_output);
}
bool wlr_backend_start(struct wlr_backend *backend) {
if (backend->impl->start) {
return backend->impl->start(backend);
}
return true;
}
void wlr_backend_destroy(struct wlr_backend *backend) {
if (!backend) {
return;
}
if (backend->impl && backend->impl->destroy) {
backend->impl->destroy(backend);
} else {
free(backend);
}
}
struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend) {
if (backend->impl->get_renderer) {
return backend->impl->get_renderer(backend);
}
return NULL;
}
static size_t parse_outputs_env(const char *name) {
const char *outputs_str = getenv(name);
if (outputs_str == NULL) {
return 1;
}
char *end;
int outputs = (int)strtol(outputs_str, &end, 10);
if (*end || outputs < 0) {
wlr_log(L_ERROR, "%s specified with invalid integer, ignoring", name);
return 1;
}
return outputs;
}
static struct wlr_backend *attempt_wl_backend(struct wl_display *display) {
struct wlr_backend *backend = wlr_wl_backend_create(display, NULL);
if (backend == NULL) {
return NULL;
}
size_t outputs = parse_outputs_env("WLR_WL_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_wl_output_create(backend);
}
return backend;
}
#ifdef WLR_HAS_X11_BACKEND
static struct wlr_backend *attempt_x11_backend(struct wl_display *display,
const char *x11_display) {
struct wlr_backend *backend = wlr_x11_backend_create(display, x11_display);
if (backend == NULL) {
return NULL;
}
size_t outputs = parse_outputs_env("WLR_X11_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_x11_output_create(backend);
}
return backend;
}
#endif
static struct wlr_backend *attempt_headless_backend(
struct wl_display *display) {
struct wlr_backend *backend = wlr_headless_backend_create(display);
if (backend == NULL) {
return NULL;
}
size_t outputs = parse_outputs_env("WLR_HEADLESS_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_headless_add_output(backend, 1280, 720);
}
return backend;
}
static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
const char *name) {
if (strcmp(name, "wayland") == 0) {
return attempt_wl_backend(display);
#ifdef WLR_HAS_X11_BACKEND
} else if (strcmp(name, "x11") == 0) {
return attempt_x11_backend(display, NULL);
#endif
} else if (strcmp(name, "headless") == 0) {
return attempt_headless_backend(display);
}
return NULL;
}
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
struct wlr_backend *backend = wlr_multi_backend_create(display);
if (!backend) {
wlr_log(L_ERROR, "could not allocate multibackend");
return NULL;
}
const char *name = getenv("WLR_BACKEND");
if (name) {
struct wlr_backend *subbackend = attempt_backend_by_name(display, name);
if (subbackend) {
wlr_multi_backend_add(backend, subbackend);
return backend;
} else {
wlr_log(L_ERROR, "unrecognized backend '%s'", name);
return NULL;
}
}
if (getenv("WAYLAND_DISPLAY") || getenv("_WAYLAND_DISPLAY") ||
getenv("WAYLAND_SOCKET")) {
struct wlr_backend *wl_backend = attempt_wl_backend(display);
if (wl_backend) {
wlr_multi_backend_add(backend, wl_backend);
return backend;
}
}
#ifdef WLR_HAS_X11_BACKEND
const char *x11_display = getenv("DISPLAY");
if (x11_display) {
struct wlr_backend *x11_backend =
attempt_x11_backend(display, x11_display);
if (x11_backend) {
wlr_multi_backend_add(backend, x11_backend);
return backend;
}
}
#endif
// Attempt DRM+libinput
struct wlr_session *session = wlr_session_create(display);
if (!session) {
wlr_log(L_ERROR, "Failed to start a DRM session");
wlr_backend_destroy(backend);
return NULL;
}
struct wlr_backend *libinput = wlr_libinput_backend_create(display, session);
if (libinput) {
wlr_multi_backend_add(backend, libinput);
} else {
wlr_log(L_ERROR, "Failed to start libinput backend");
wlr_backend_destroy(backend);
wlr_session_destroy(session);
return NULL;
}
int gpus[8];
size_t num_gpus = wlr_session_find_gpus(session, 8, gpus);
struct wlr_backend *primary_drm = NULL;
wlr_log(L_INFO, "Found %zu GPUs", num_gpus);
for (size_t i = 0; i < num_gpus; ++i) {
struct wlr_backend *drm = wlr_drm_backend_create(display, session,
gpus[i], primary_drm);
if (!drm) {
wlr_log(L_ERROR, "Failed to open DRM device");
continue;
}
if (!primary_drm) {
primary_drm = drm;
}
wlr_multi_backend_add(backend, drm);
}
if (!primary_drm) {
wlr_log(L_ERROR, "Failed to open any DRM device");
wlr_backend_destroy(libinput);
wlr_session_destroy(session);
wlr_backend_destroy(backend);
return NULL;
}
return backend;
}
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